Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b6430c7bf1646b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 00:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e437f8d02b089f0e793cc5f757be4f2 SHA-1: f313635a0d1d1d298a2e12d448097efa7c431fa0 SHA-256: c9b6430c7bf1646bd048cf0b700b2f2a7ddc0e3d293ac19893b775411df99d35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=how+to+open+cleo+menu+in+gta+sa+android PDF link annotation
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/lamuzisujewugisadevir.pdfIn PDF document text
    • http://rld-carbon.com/file/14357134441.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904160008030.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/sabimodoz.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109080357226110.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630624037/file/kogobogoxunefebasubanif.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/28639508037.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/rivesutikek.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dabikutogamor.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/31578717798.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2ad136fd3---86540818313.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/nixevopikuwanogegozutan.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/fotabesoko.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/72873928957.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210902_565D578657F31406.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/47976580939.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/guvixafuwovi.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/89859808871.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/defitutukep.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133373417eaa---towub.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/svtp3ng076nlmtfuclutesnjem/terupivavokapuzobitezu.pdfIn PDF document text
    • http://timebymtm.com/upload/files/zaxakeximudanepudoputila.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/sepowulezijovuwejagozibes.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/83585123506.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 18136 bytes
SHA-256: b83f18ffd7cecebc75072b7c7d3d9183a9d3834b294bd79091d2075bc0b62c05
font_02_sfnt_off00012176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 11032 bytes
SHA-256: 539c15d4b071ad1fa62a8bb993cfed03cf35d263bf2a707b5a25f8f4a63ade19

Open this report in the interactive analyzer, or submit your own file for analysis.